I managed to remove comments froma cpp file

Very good.
I just enhanced it, because your programa was failing when you put "/*" as a string, so it was not a commentary and the program was treating it like commentary.

I organized it in classes to. Thanks.

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MAIN.CPP

/* Federal University of Minas Gerais - UFMG
Engineering School
Object Oriented Design, Project and Programming
Practical Work 2;part 1
Professor: Renato Mesquita
Group: Danilo Gomes
Bruno Damiao
*/
#include <iostream>
#include <fstream>
#include <string>
#include "FFiles.h"

using namespace std;

void main()
{ FFiles readFile;

string infile, outfile; //in and out file name
ifstream source; // declaration of the stream files.
ofstream target;
do{
cout << "Enter Input File Name: ";
cin >> infile;
}while(source.f ail());//while file reading fails, keep asking for input file name

cout << "Enter Output File Name: ";
cin >> outfile;

source.open(inf ile.c_str());
target.open(out file.c_str());

readFile.remove _comments(sourc e, target); //Calling the function,

source.close();//to close the opened files.
target.close();

}

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FFILES.H

//declaration of FFiles
#include <fstream>

using namespace std;

class FFiles{

public:

void remove_comments (ifstream&, ofstream&); // Function declaration.
void checkCommentsSl ashSlash(string &, bool&, ofstream&);
void checkComments(s tring&, bool&, ofstream&);
};

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FFILES.CPP

//Definition of FFiles
#include <string>
#include <fstream>
#include <iostream>
#include <vector>
#include "FFiles.h"

using namespace std;

void FFiles::checkCo mmentsSlashSlas h(string& line, bool& flag, ofstream& Target)
{
if (!flag)
{
for(int i = 0; i < line.length(); ++i )
{
if((line.at(i) == '/') && (line.at(i+1) == '/')) // searching for " // " to eliminate all its content.
break;
else
Target << line[i]; // copy the character of the position i to the Target
}
Target << endl;
}
}//end FFiles::checkCo mmentsSlashSlas h

void FFiles::checkCo mments(string& line, bool& flag, ofstream& Target)
{
int contaAspas = 1; //initialized as 1, because if don't find "/*" will not set flag true
if (line.find("/*") < line.length()) // searching for " /* " to eliminate it and all its content.
//the .find searchs in the forward direction for the first occurrence of a substring that matches
//the specified sequence of characters and returns its position
{
contaAspas = 0;
for(int i = 0; i < line.find("/*"); ++i ){ //check if "/*" is or isn't a commentary
if((line.at(i) == '"'))
contaAspas++;
}
}
if((contaAspas % 2) == 0) //in case of even quotation marks it's a commentary
flag = true;

checkCommentsSl ashSlash(line, flag, Target); //check the "//" comments

if (flag)
{
if (line.find("*/") < line.length()) //when it finds the end of commentary, it restarts to copy
flag = false;
}
}//end FFiles::checkCo mments


void FFiles::remove_ comments (ifstream& Source ,ofstream& Target)
{
string line; //auxiliar string to store the read line
bool flag = false;

while (!Source.eof()) // This loop is to get assure that the whole input file is read.
{
getline(Source, line); // To read line by line.
//checks comments for the read line
checkComments(l ine, flag, Target);

}//end while
}//end FFiles::remove_ comments

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Hope it be helpful!